I have them on all 3 of my garmin units. Just convert the Lowrance files to gpx.
Do they show up as a track?
Shows up as waypoints and my track saves as I drive.
My LOP chip uploaded as waypoints and tracks.
Unless Garmin has updated their unit software Boatlane's tracks will not display properly.
For example, Lake o' the Pines will display something like this Google Earth image. Notice how the track-end-points are incorrectly connected:
Lake o' the Pines should display like this: